1: Think at length about lost planet, comet (11)
2: Surprise running through bras to underpants (7)
4: This food won't give you a heavy feeling (5,4)
5: Colder here in Paris emergency room (5)
6: Minor work taking half a month - an endless epistle (9)
7: Gambler in the middle to call and raise (5,2)
8: Sheep to start wallowing in ease (3)
12: Pretty girl takes part in outdoor cooking? No just toys (6, 5).
13: Copy hasn't disturbed yes-man (9)
14: Giddy Texan rube gets out of hand (9)
16: Awfully servile experiences again (7)
17: It's over, over, over, kept apart by past payment (7)
19: African leader reversed stance on fabled writer (5)
20: Meal for 4 divided by 50 (5)
21: Bloody bored inside (3)